侵蚀面小、水平浅的患者建议使用球形电极消融术；
To the surface erosion in small, shallow level of patients, the spherical electrode ablation is recommended;
通过计算半球静电支承下球形转子与电极之间的间隙，导出了静电力与间隙的关系。
The clearance between the spherical rotor and electrodes is calculated under hemisphere electrostatic suspension and the relationship between the electrostatic force and the clearance is derived.
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